Sealed Bladder Assembly and Method

ABSTRACT

A bladder assembly including a body, a bladder received in the body, the bladder defining an internal volume and including an annular sealing bead, the sealing bead defining an opening into the internal volume, and a sealing member including a shaft having a first end and a second end, and an engagement portion connected proximate the second end, the sealing member being partially received within the internal volume and being moveable between at least a first position, wherein the engagement portion is spaced from the sealing bead, and a second position, wherein the sealing bead is compressed between the engagement portion and the body.

FIELD

This application relates to bladder sealing and, more particularly, toapparatus and methods for sealing a bladder for pressure testing.

BACKGROUND

Various parts, such as composite parts, are subjected to high pressureswhile in use. Therefore, during the research and development phase, suchparts are vigorously tested to ensure they are capable of withstandinghigh pressures for prolonged periods of time. Indeed, parts are oftentested at pressures that are significantly higher than the pressures atwhich the parts were design to operate.

Pressure testing, particularly high pressure testing, typically involvesintroducing a pressurized fluid, such as a gas or hydraulic fluid, toact on the part under test. Depending on the structure and compositionof the part, it may be difficult to maintain the pressures required torun the test to completion. For example, parts with holes and/or partsconstructed from porous materials may be difficult to subject to highpressures.

Thus, bladders have been used in pressure testing. For example, abladder may be inserted into a bore within the part under test and thenthe bladder may be pressurized. The bladder contains the pressurizedfluid, thereby facilitating pressure testing of various parts, includingparts with holes.

Unfortunately, using bladders for pressure testing introduces anadditional step, which often complicates the test and increases costs.For example, it often becomes quite difficult to obtain a proper,pressure-tight seal in the bladder, particularly when the bladder isbeing used for high pressure testing.

Accordingly, those skilled in the art continue with research anddevelopment efforts in the field of pressure testing.

SUMMARY

In one embodiment, the disclosed bladder assembly may include a body, abladder received in the body, the bladder defining an internal volumeand including an annular sealing bead, the annular sealing bead definingan opening into the internal volume, and a sealing member including ashaft having a first end and a second end, and an engagement portionconnected proximate the second end, the sealing member being partiallyreceived within the internal volume and being moveable between at leasta first position, wherein the engagement portion is spaced from thesealing bead, and a second position, wherein the sealing bead iscompressed between the engagement portion and the body.

In another embodiment, the disclosed bladder assembly may include a bodydefining a bore, a bladder closely received in the bore, the bladderdefining an internal volume and including an annular sealing bead, thesealing bead defining an opening into the internal volume, a plugconnected to the body to enclose the bore, the plug defining a recessand a bore extending from the recess, and a sealing member including ashaft having a first end and a second end, wherein the shaft extendsthrough the bore in the plug such that the first end extends outside ofthe body and the second end extends into the internal volume, and anengagement portion connected proximate the second end, the engagementportion including a ramped portion, a seat portion and a flange, theseat portion being positioned between the ramped portion and the flange,wherein the first end of the shaft is withdrawn from the body such thatthe sealing bead is seated on the seat portion and compressed betweenthe seat portion and the body.

In yet another embodiment, also disclosed is a method for sealing abladder. The bladder may define an internal volume and may include anannular sealing bead, the sealing bead may define an opening into theinternal volume. The method may include the steps of (1) providing asealing member and a body, the body defining a bore, the sealing memberincluding a shaft having a first end and a second end, and an engagementportion connected proximate the second end; (2) inserting the sealingmember into the bladder such that the engagement portion is received inthe internal volume and a portion of the shaft extends from the internalvolume; (3) inserting the bladder into the bore; (4) plugging the boresuch that the bladder and the engagement portion of the shaft areenclosed in the bore and the first end of the shaft extends outside ofthe body; and (5) applying a pulling force to the first end of the shaftto at least partially withdraw the sealing member and compress thesealing bead between the body and the engagement portion.

Other embodiments of the disclosed bladder assembly and method willbecome apparent from the following detailed description, theaccompanying drawings and the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side elevational view, in section, of one embodiment of thedisclosed bladder assembly, shown in a sealed configuration;

FIG. 2 is a side elevational view, in section, of a portion of the bodyof the bladder assembly of FIG. 1;

FIG. 3 is a side elevational view, in section, of the bladder of thebladder assembly of FIG. 1;

FIG. 4 is a side elevational view, in section, of the sealing member ofthe bladder assembly of FIG. 1;

FIG. 5 is a side elevational view, in section, of the bladder assemblyof FIG. 1, shown during a first stage of assembly;

FIG. 6 is a side elevational view, in section, of the bladder assemblyof FIG. 5, shown during a second stage of assembly;

FIG. 7 is a side elevational view, in section, of the bladder assemblyof FIG. 6, shown during a third stage of assembly;

FIG. 8 is a side elevational view, in section, of the bladder assemblyof FIG. 7, shown during a fourth, sealed stage of assembly;

FIG. 9 is flow chart illustrating one embodiment of the disclosed methodfor sealing a bladder.

FIG. 10 is a flow diagram of aircraft production and servicemethodology; and

FIG. 11 is a block diagram of an aircraft.

DETAILED DESCRIPTION

Referring to FIG. 1, one embodiment of the disclosed bladder assembly,generally designated 10, may include a body 12, a bladder 14 and sealingassemblies 16. While the bladder assembly 10 is shown in FIG. 1 with twosealing assemblies 16 on opposed first and second ends 18, 20 of thebody 12, those skilled in the art will appreciate that only one sealingassembly 16 (or three or more sealing assemblies 16) may be useddepending on the application and without departing from the scope of thepresent disclosure.

The body 12 may be any structure capable of receiving the bladder 14,such as within a bore 22 defined by the body 12. For example, the body12 may be an elongated tubular structure, as shown in FIG. 1. However,bodies of various shapes, geometries and sizes may be used. As onespecific, non-limiting example, the body 12 may be a component of avehicle, such as a terrestrial vehicle, a waterborne vessel or anaerospace vehicle, that may be subjected to pressurization while in use.

The body 12 may be constructed from various materials. As onenon-limiting example, the body 12 may be formed from a polymericmaterial, such as an extruded plastic. As another non-limiting example,the body 12 may be formed from a composite material, such as a compositematerial having reinforcing fibers in a polymer (e.g., epoxy-based)matrix. As yet another non-limiting example, the body 12 may be formedfrom a metal or metal alloy, such as a high-strength aluminum alloy.

While not shown in FIG. 1, the body 12 may include various pores,cracks, holes or other through passageways in fluid communication withthe bore 22, thereby rendering the bore 22 a non-fluid-tight bore.Therefore, use of the bladder 14 within the non-fluid-tight bore 22 mayfacilitate pressure testing of the body 12. Of course, a fluid-tight (orsubstantially fluid-tight) bore 22 may also be used, thereby renderingthe bladder 14 a prophylactic component during pressure testing of thebody 12.

The bore 22 may extend from proximate (at or near) the first end 18 ofthe body 12 to proximate the second end 20 of the body 12. As shown inFIG. 2, an opening 24 in the first end 18 of the body 12 may provideaccess to the bore 22. A similar opening may be formed in the second end20 of the body 12 to provide access to the bore 22 at the second end 20of the body 12.

Referring to FIG. 2, the bore 22 defined by the body 12 may have across-sectional profile and a maximum inner cross-sectional dimension(e.g., inner diameter) D configured to closely receive the bladder 14.For example, the bore 22 may have a generally circular cross-sectionalprofile. However, bores 22 having various shapes and configurations maybe used without departing from the scope of the present disclosure.

Referring to FIG. 3, the bladder 14 may include a body 26 having a firstend 28 and a second end 30. In one particular construction, the body 26of the bladder 14 may be elongated along a longitudinal axis A such thatthe first end 28 of the body 26 is longitudinally opposed from thesecond end 30 of the body 26. While the bladder 14 is shown in FIG. 3having an elongated cylindrical body 26 with a shape and configurationthat closely corresponds to the shape and configuration of the bore 22in the body 12 (e.g., the outer diameter E of the bladder 14 (unloaded)may be substantially equal to the inner diameter D of the bore 22),those skilled in the art will appreciate that the body 26 of the bladder14 may have various shapes and configurations, depending, for example,on the shape and configuration of the bore 22 in the body 12, withoutdeparting from the scope of the present disclosure.

The body 26 of the bladder 14 may be formed from an elastomericmaterial, such as by molding or extruding the elastomeric materials.Various elastomeric materials and forming techniques may be used.Elastomeric material selection may include consideration of endapplication, such as the type of pressurizing fluid (e.g., air; water;hydraulic fluid) that may be used to pressurize the bladder. As onenon-limiting example, the body 26 of the bladder 14 may be formed fromnatural and/or synthetic rubber. As another non-limiting example, thebody 26 of the bladder 14 may be formed from silicone rubber. As yetanother non-limiting example, the body 26 of the bladder 14 may beformed from a fluoropolymer elastomer material.

The body 26 of the bladder 14 may define an internal volume 32. A firstopening 34 in the body 26 may provide access to the internal volume 32proximate the first end 28 of the body 26. A second opening 36 in thebody 26 may provide access to the internal volume 32 proximate thesecond end 30 of the body 26.

At this point, those skilled in the art will appreciated that thebladder 14 has two openings 34, 36 because the body 12 (FIG. 1) thatreceives the bladder 14 has two openings 24 (FIG. 2). However, bladders14 having only one opening 34 (e.g., the second end 30 may bepre-sealed) and bladders 14 having three or more openings (e.g., aT-shaped bladder) are also contemplated.

A first sealing bead 38 may be connected to the body 26 of the bladder14 proximate the first end 28 of the body 26. The first sealing bead 38may be an annular structure and may protrude inward from the body 26. Inone particular construction, the first sealing bead 38 may be integralwith the first end 28 of the body 26 (the first sealing bead 38 and thebody 26 may be formed as a single monolithic body). For example, thefirst sealing bead 38 may be co-molded with the first end 28 of the body26.

A second sealing bead 40 may be connected to the body 26 of the bladder14 proximate the second end 30 of the body 26. The second sealing bead40 may be an annular structure and may protrude inward from the body 26.In one particular construction, the second sealing bead 40 may beintegral with the second end 30 of the body 26 (the second sealing bead40 and the body 26 may be formed as a single monolithic body). Forexample, the second sealing bead 40 may be co-molded with the second end30 of the body 26.

Thus, as is described in greater detail herein, the first and secondsealing beads 38, 40 may act as integral 0-rings for sealing the firstand second ends 28, 30, respectively, of the body 26 of the bladder 14.While the first and second sealing beads 38, 40 are shown in thedrawings as having a generally circular or ellipsoidal (0-ring)cross-sectional profile, the use of other profile shapes/geometries isalso contemplated.

Referring for a moment to FIG. 8, each sealing assembly 16 (only one isshown in FIG. 8; both are shown in FIG. 1) may include a sealing member50, a plug 52, a fastening member 54 and a retaining member 56.Optionally, such as, for example, in very high pressure applications,the sealing assembly 16 may additionally include a back-up ring 58.Additional (or fewer) components may be included in the sealing assembly16 without departing from the scope of the present disclosure.

Referring now to FIG. 4, the sealing member 50 of each sealing assembly16 (FIG. 1) may include a shaft 60 and an engagement portion 62. Theshaft 60 may be elongated along a longitudinal axis B, and may include afirst end 64 longitudinally opposed from a second end 66. The shaft 60may optionally define a fluid channel 68 that extends from proximate thefirst end 64 to proximate the second end 66.

In one specific realization, the outer surface 70 of the shaft 60 may bethreaded. Therefore, the retaining member 56 (FIG. 7), which may be anut (e.g., a jam nut) or the like, may be threaded onto the shaft 60, asis described in greater detail herein. Of course, when the retainingmember 56 does not require a threaded engagement with the shaft 60, theouter surface 70 of the shaft 60 need not be threaded.

The engagement portion 62 may be circumferentially received over theshaft 60 proximate the second end 66 of the shaft 60. As shown in FIG.4, the shaft 60 and the engagement portion 62 may be separate pieces,and the engagement portion 62 may be fixedly connected to the second end66 of the shaft 60, such as with a threaded engagement, an interferencefit, mechanical fasteners, one or more welds or the like. Alternatively,the engagement portion 62 may be integral with the shaft 60 (the shaft60 and the engagement portion 62 may be formed as a single monolithicbody).

The engagement portion 62 may include a first end 72 and a second end 74longitudinally opposed from the first end 72. The engagement portion 62may include a ramped portion 76 proximate the first end 72 of theengagement portion 62, an optional tapered portion 78 proximate thesecond end 74 of the engagement portion 62, and a seat portion 80extending between the ramped portion 76 and the tapered portion 78.

The ramped portion 76 of the engagement portion 62 may be ramped (e.g.,may increase in diameter) from proximate the first end 72 of theengagement portion 62 to proximate the seat portion 80. The taperedportion 78 of the engagement portion 62 may be tapered (e.g., maydecrease in diameter) from proximate the seat portion 80 to proximatethe second end 74 of the engagement portion 62. The seat portion 80 mayhave a substantially uniform diameter extending from proximate theramped portion 76 to proximate the tapered portion 78, which may definea first gland surface 82. The transition from the tapered portion 78 tothe seat portion 80 may define a flange 84, which may define a secondgland surface 86.

Referring to FIGS. 5-9, disclosed is a method 200 (FIG. 9) for sealing abladder. The method 200 is described below with reference to FIGS. 5-8,in which only one of the sealing assemblies 16 is shown. Those skilledin the art will appreciate that the other sealing assembly 16 (shown inFIG. 1, but not shown in FIGS. 5-8) may be assembled in a manner similarto the sealing assembly 16 shown in FIGS. 5-8 to fully assemble and sealthe disclosed bladder assembly 10.

The first assembly step (block 202 in FIG. 9) may include providing abody 12, a bladder 14 and a sealing assembly 16.

The second assembly step (block 204 in FIG. 9) may include inserting thesealing member 50 into the bladder 14. As shown in FIG. 5, theengagement portion 62 of the sealing member 50 may be inserted into theinternal volume 32 of the bladder 14 by way of the first opening 34(FIG. 3) in the body 26 of the bladder 14. The tapered portion 78 of theengagement portion 62 may facilitate insertion of the sealing member 50through the first opening 34 in the bladder 14 by urging the firstsealing bead 38 outward as the tapered portion 78 is urged through thefirst opening 34.

The third assembly step (block 206 in FIG. 9) may include inserting thebladder 14 into the body 12. As shown in FIG. 5, an opening 24 in thebody 12 may provide access to the bore 22 defined by the body 12. Thebladder 14 (with the sealing member 50 inserted therein and extendingtherefrom) may be inserted into the bore 22 defined by the body 12 byway of the opening 24 in the body 12. When the bladder 14 is fullyinserted into the body 12, the shaft 60 of the sealing member 50 mayextend through the opening 24 such that a portion of the shaft 60 isoutside of the body 12.

The fourth assembly step (block 208 in FIG. 9) may include plugging theopening 24 in the body 12. As shown in FIG. 6, the plug 52 may beinserted into the opening 24 in the body 12 to enclose the opening 24,while permitting the shaft 50 of the sealing member 50 to extendtherethrough.

The plug 52 may include a distal end 90 sized and shaped to be receivedthrough the opening 24 in the body 12 and to extend into the bore 22.The distal end 90 of the plug 52 may include a face surface 91, whichmay define a third gland surface. A recess 94 may be formed in the facesurface 91 to receive therein a portion of the engagement portion 62 ofthe sealing member 50 during sealing, as is described in greater detailherein. The rear wall 96 of the recess 94 may define the depth of therecess 94 and may function as a stop for the engagement portion 62 ofthe sealing member 50.

The plug 52 may further define a bore 98 that may longitudinally extendfrom the recess 94 to the proximal end 100 of the plug 52. The bore 98may be sized and shaped to closely receive the shaft 60 of the sealingmember 50. Therefore, the shaft 60 of the sealing member 50 may extend(e.g., slidably) through the plug 52, but an interference engagementbetween the engagement portion 62 of the sealing member 50 and the rearwall 96 of the recess 94 may inhibit rearward movement (arrow R in FIG.8) of the sealing member 50 beyond a pre-defined point.

The plug 52 may include an annular flange 102 to engage the body 12,thereby controlling the depth to which the distal end 90 of the plug 52protrudes into the bore 22 of the body 12. As shown in FIG. 6, theflange 102 of the plug 52 may be in abutting engagement with the body12. As shown in FIG. 7, the fastening member 54 may secure the plug 52to the body 12. As one specific, non-limiting example, the fasteningmember 54 may be a C-nut or the like, and may be received over theproximal end 100 of the plug 52 and threaded into engagement with thebody 12, as shown in FIG. 7. However, various fastening members, such asbolts, screws, pins or the like, may be used to secure the plug 52 tothe body 12 without departing from the scope of the present disclosure.

In one optional implementation, the back-up ring 58 may be insertedprior to inserting the plug 52. The back-up ring 58 may be positionedagainst the sealing bead 38 of the bladder 14 and may be urged againstthe sealing bead 38 by the face surface 91 of the plug 52. Therefore,rather than the face surface 91 of the plug 52 acting as the third glandsurface, the back-up ring 58 may act as the third gland surface 92, asshown in FIG. 7.

The fifth assembly step (block 210 in FIG. 9) may include withdrawingthe sealing member 50 from the body 12 by applying a pulling force(arrow R in FIG. 8) to the shaft 60 of the sealing member 50 to move theengagement portion 62 of the sealing member 50 from a first position(engagement portion 62 not engaged with the sealing bead 38) to a secondposition (engagement portion 62 engaged with the sealing bead 38).Therefore, the step of withdrawing the sealing member 50 from the body12 may pre-load the bladder 14.

Various techniques may be used to withdraw the sealing member 50 fromthe body 12. As one example, the sealing member 50 may be manuallywithdrawn, such as by gripping the shaft 60 of the sealing member 50 andapplying a pulling force (arrow R). As another example, the sealingmember 50 may be withdrawn by threading the retaining member 56 onto theshaft 60 of the sealing member 50 and tightening the retaining member 56against the plug 52 to urge the shaft in the direction shown by arrow R.Other techniques may also be used without departing from the scope ofthe present disclosure.

Referring to FIGS. 7 and 8, as the sealing member 50 is withdrawn (arrowR) from the body 12, the engagement portion 62 of the sealing member 50may engage and compress the sealing bead 38 of the bladder 14.Initially, the ramped portion 76 may compress the sealing bead 38. Asthe sealing member 50 is further withdrawn, the sealing bead 38 maybecome seated on the seat portion 80 of the sealing member 50 and,therefore, may be radially compressed between the seat portion 80 andthe body 12. As the sealing member 50 is still further withdrawn, thesealing bead 38 may become axially compressed between the back-up ring58 and the flange 84 of the engagement portion 62 of the sealing member50. Eventually, the engagement portion 62 of the sealing member 50 maycome into abutting engagement with the rear wall 96 of the recess 94 inthe plug 52, as shown in FIG. 8, thereby inhibiting further withdrawalof the sealing member 50.

Thus, when the sealing member 50 is fully withdrawn, a gland may bedefined by the first, second and third gland surfaces 82, 86, 92, whichmay be defined, respectively, by the seat portion 80 of the engagementportion 62 of the sealing member 50, the flange 84 of the engagementportion 62 of the sealing member 50, and the back-up ring 58 (or theface surface 91 of the plug 52).

The sixth assembly step (block 212 in FIG. 9) may include retaining thesealing member 50 in the withdrawn configuration. As shown in FIG. 8,the retaining member 56 may be a nut, such as a jam nut, and may bethreaded onto the shaft 60 of the sealing member 50 and tightenedagainst the plug 52 to retain the shaft 60 in the withdrawnconfiguration. However, use of other retaining members and retainingtechniques is also contemplated. As one alternative, the retainingmember 56 may be a pin engaged with the shaft 60 of the sealing member50. As another alternative, the retaining member 56 may be a clampsecured to the shaft 60 of the sealing member 50.

Accordingly, disclosed is a system and method for sealing a bladder 14within a body 12. Once sealed (pre-loaded), the bladder 14 may bepressurized, such as by introducing a fluid (e.g., pressurized air orhydraulic fluid) to the internal volume 32 of the bladder 14 by way ofthe fluid channel 68 (FIG. 4) defined by the shaft 60 of the sealingmember 50.

Examples of the disclosure may be described in the context of anaircraft manufacturing and service method 1000, as shown in FIG. 10, andan aircraft 1002, as shown in FIG. 11. During pre-production, examplemethod 1000 may include specification and design 1004 of the aircraft1002 and material procurement 1006. During production, component andsubassembly manufacturing 1008 and system integration 1010 of theaircraft 1002 takes place. Thereafter, the aircraft 1002 may go throughcertification and delivery 1012 in order to be placed in service 1014.While in service by a customer, the aircraft 1002 is scheduled forroutine maintenance and service 1016, which may also includemodification, reconfiguration, refurbishment and the like.

Each of the processes of method 1000 may be performed or carried out bya system integrator, a third party, and/or an operator (e.g., acustomer). For the purposes of this description, a system integrator mayinclude without limitation any number of aircraft manufacturers andmajor-system subcontractors; a third party may include withoutlimitation any number of venders, subcontractors, and suppliers; and anoperator may be an airline, leasing company, military entity, serviceorganization, and so on.

As shown in FIG. 11, the aircraft 1002 produced by example method 1000may include an airframe 1018 with a plurality of systems 1020 and aninterior 1022. Examples of high-level systems 1020 include one or moreof a propulsion system 1024, an electrical system 1026, a hydraulicsystem 1028, and an environmental system 1030. Any number of othersystems may be included. Although an aerospace example is shown, theprinciples of the invention may be applied to other industries, such asthe automotive industry.

Apparatus and methods embodied herein may be employed during any one ormore of the stages of the production and service method 1000. Forexample, components or subassemblies corresponding to production process1008 may be fabricated or manufactured in a manner similar to componentsor subassemblies produced while the aircraft 1002 is in service. Also,one or more apparatus examples, method examples, or a combinationthereof may be utilized during the production stages 1008 and 1010, forexample, by substantially expediting assembly of or reducing the cost ofan aircraft 1002. Similarly, one or more of apparatus examples, methodexamples, or a combination thereof may be utilized while the aircraft1002 is in service, for example and without limitation, to maintenanceand service 1016.

Although various embodiments of the disclosed bladder assembly andmethod have been shown and described, modifications may occur to thoseskilled in the art upon reading the specification. The presentapplication includes such modifications and is limited only by the scopeof the claims.

What is claimed is:
 1. A bladder assembly comprising: a body; a bladderreceived in said body, said bladder defining an internal volume andcomprising an annular sealing bead, said sealing bead defining anopening into said internal volume; and a sealing member comprising: ashaft having a first end and a second end; and an engagement portionconnected proximate said second end, said sealing member being partiallyreceived within said internal volume and being moveable between at leasta first position and a second position, wherein said engagement portionis spaced from said sealing bead in said first position, and whereinsaid sealing bead is compressed between said engagement portion and saidbody in said second position.
 2. The bladder assembly of claim 1 whereinsaid body defines a bore, and wherein said bladder is closely receivedwithin said bore.
 3. The bladder assembly of claim 1 wherein saidbladder comprises an elongated body having a first end and an opposedsecond end.
 4. The bladder assembly of claim 3 wherein said sealing beadis integral with said body.
 5. The bladder assembly of claim 3 whereinsaid sealing bead is positioned proximate said first end of said body.6. The bladder assembly of claim 1 wherein said bladder comprises anelastomeric material.
 7. The bladder assembly of claim 1 wherein saidsealing bead protrudes inward.
 8. The bladder assembly of claim 1wherein said shaft extends through said opening such that said first endis outside of said internal volume.
 9. The bladder assembly of claim 1wherein said engagement portion comprises: a ramped portion; and a seatportion adjacent to said ramped portion, wherein said sealing bead iscompressed between said seat portion and said body in said secondposition.
 10. The bladder assembly of claim 9 wherein said seat portionterminates at a flange.
 11. The bladder assembly of claim 9 wherein saidengagement portion further comprises a tapered portion, and wherein saidseat portion is positioned between said tapered portion and said rampedportion.
 12. The bladder assembly of claim 1 further comprising a plugconnected to said body, wherein said shaft extends through said plug.13. The bladder assembly of claim 12 wherein said sealing bead isaxially compressed between said engagement portion and said body in saidsecond position.
 14. The bladder assembly of claim 12 further comprisinga back-up ring positioned between said sealing bead and said plug. 15.The bladder assembly of claim 1 further comprising a retaining memberconnected to said shaft to retain said sealing member in said secondposition.
 16. A bladder assembly comprising: a body defining a bore; abladder closely received in said bore, said bladder defining an internalvolume and comprising an annular sealing bead, said sealing beaddefining an opening into said internal volume; a plug connected to saidbody to enclose said bore, said plug defining a recess and a boreextending from said recess; and a sealing member comprising: a shafthaving a first end and a second end, wherein said shaft extends throughsaid bore in said plug such that said first end extends outside of saidbody and said second end extends into said internal volume; and anengagement portion connected proximate said second end, said engagementportion comprising a ramped portion, a seat portion and a flange, saidseat portion being positioned between said ramped portion and saidflange, wherein said first end of said shaft is withdrawn from said bodysuch that said sealing bead is seated on said seat portion andcompressed between said seat portion and said body.
 17. The bladderassembly of claim 16 wherein said sealing bead is further compressedbetween said flange and said plug.
 18. The bladder assembly of claim 16further comprising a back-up ring positioned between said sealing beadand said plug, wherein said sealing bead is further compressed betweensaid flange and said back-up ring.
 19. A method for sealing a bladder,said bladder defining an internal volume and comprising an annularsealing bead, said sealing bead defining an opening into said internalvolume, said method comprising: providing a sealing member and a body,said body defining a bore, said sealing member comprising a shaft havinga first end and a second end, and an engagement portion connectedproximate said second end; inserting said sealing member into saidbladder such that said engagement portion is received in said internalvolume and a portion of said shaft extends from said internal volume;inserting said bladder into said bore; plugging said bore such that saidbladder and said engagement portion are enclosed in said bore and saidfirst end of said shaft extends outside of said body; and applying apulling force to said shaft to at least partially withdraw said sealingmember and compress said sealing bead between said body and saidengagement portion.
 20. The method of claim 19 further comprising thestep of retaining said sealing member in said withdrawn configuration.